Once upon a time, Cat Starr lived with her astronaut mom in Houston. But when her mother gets sent on a last-minute space mission, Cat is shipped off to a faraway land—her dad's house, halfway across the country—to share a room with her real-life evil stepsister, Olivia. Just when Cat can't take it any more, Great-Aunt Abyssinia comes to the rescue. And things go from bad to worse.

Out of nowhere, toads start appearing whenever she opens her mouth. At the same time, Olivia spouts precious gems and flowers when she speaks. How unfair is that? Before you can say "happily ever after," the girls are on the run from jewel thieves and a secret government agency. Can Cat save the day—and get rid of all those toads?